Data Sheet

AL8805
Document number: DS35030 Rev. 4 - 2
6 of 16
www.diodes.com
July 2012
© Diodes Incorporated
A
L8805
Typical Performance Characteristics (cont.) (@T
A
= +25°C, unless otherwise specified.)
80%
82%
84%
86%
88%
90%
92%
94%
96%
98%
100%
6 9 12 15 18 21 24 27 33
INPUT VOLTAGE (V)
Figure 13 Efficiency vs. Input Voltage
EFFI
C
IEN
C
Y
30 36
1 LED
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
7 LEDs
8 LEDs
L = 100µH
R = 150m
T = 25°C
S
A
Ω
2 LEDs
4 LEDs
5 LEDs
6 LEDs
8 LEDs
INPUT VOLTAGE (V)
Figure 14 330mA LED Current vs. Input Voltage
LED
C
U
R
R
ENT (A)
0.30
0.31
0.32
0.33
0.34
0.35
0.36
6 9 12 15 18 21 24 27 30 33 36
1 LED
3 LEDs
L = 68 H
R = 300m
T = 25C
µ
°
S
A
Ω
7 LEDs
0
50
100
150
200
250
300
350
INPUT VOLTAGE (V)
Figure 15 Switching Frequency vs. Input Voltage
L = 100 H
R = 150m
T = 25C
µ
°
S
A
Ω
SWITCHING FREQUENCY (kHz)
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1 LED
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
7 LEDs
8 LEDs
6 9 12 15 18 21 24 27 36
INPUT VOLTAGE (V)
Figure 16 670mA LED Current vs. Input Voltage
LED CURRENT (A)
0.720
30 33
0.710
0.700
0.690
0.680
0.670
0.660
0.650
0.640
0.630
0.620
INPUT VOLTAGE (V)
Figure 17 1A LED Current vs. Input Voltage
L
E
D
C
U
R
R
E
N
T
(
A
)
0.90
0.95
1.00
1.05
1.10
6 9 12 15 18 21 24 27 30 33 36